Things may be heating up between George Clooney and Elisabetta Canalis, but the actor is sparing the Italian bombshell from his signature practical jokes. "I can’t do it to her! I’ll get hit!" George told In Touch of laying off the pranks for his girlfriend at the 2010 National Board of Review awards gala in New York on January 12. Elisabetta, who has been super-serious with George since meeting him in Rome last summer, should count herself lucky - the sneaky star once put a vulgar bumper sticker on close pal Brad Pitt's car, causing an unknowing Brad to get more than a few honks as he drove through busy LA. Despite looking smitten with his brunette beauty at the A-list soiree, George remained mum on what he loves best about Elisabetta. "I can't tell you that," he laughed, arm in arm with his sexy main squeeze.